Comment 20 for bug 1220165

It should be noted that sda3 is the only partition we seem to successfully mount during probing, and that its neibour sda4 which shares a boundary with it is also potentially active as swap:

Sep 3 09:48:46 lubuntu kernel: [ 314.598101] EXT4-fs (sda3): mounted filesystem with ordered data mode. Opts: (null)
Sep 3 09:48:46 lubuntu 40lsb: result: /dev/sda3:Ubuntu Saucy Salamander (development branch) (13.10):Ubuntu:linux
[...]
Sep 3 09:45:18 lubuntu kernel: [ 94.421151] Adding 2439064k swap on /dev/sda4. Priority:-1 extents:1 across:2439064k FS
Sep 3 09:48:46 lubuntu os-prober: debug: /dev/sda4: is active swap

We should get into this situation and try and activate the emergency holographic shell and see which partitions are actually active and why. As if they are active then the kernel would correctly prevent their modification.